Forced-Sealing Ball Valve With Compact DBB Sealing Mechanism
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Solution Overview
Problem
Current DBB forced sealing valves suffer from leakage issues due to complex operating mechanisms and large valve stem sizes, which compromise sealing reliability and flow capacity, often requiring reduced port designs that restrict flow.
Innovation Solution
A DBB forced sealing valve design featuring upper and lower sealing member driving parts with inclined dovetail tracks and threads, allowing for compact, reliable sealing and simplified operation, with a valve core that drives a rocker arm mechanism for efficient sealing and flow passage optimization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a complex operating mechanism is used to achieve forced sealing, then sealing reliability is improved, but device complexity increases and valve stem size becomes huge
Solution Approach 1:
The valve core is segmented into a ball body portion and a driving portion, with the driving portion featuring threaded sections that engage with the ball body. This segmentation allows the operating mechanism to be simplified while maintaining forced sealing capability through the threaded engagement that converts rotational motion into linear displacement for seal pressing.
Solution Approach 2:
Instead of using a complex mechanism to directly press seals, the invention inverts the approach by using the valve core's own rotation, converted through threaded engagement, to generate the linear motion needed for seal pressing. The ball body rotates to control flow, and this rotation automatically drives the sealing action through the inverted logic of the threaded connection.
2Reliability
If a complex operating mechanism with large valve stem is used, then forced sealing is achieved, but valve size increases and flow capacity is reduced
Solution Approach 1:
The operating mechanism is merged with the valve core structure itself. The driving portion of the valve core integrates the threaded sections that engage with the ball body, eliminating the need for a separate complex operating mechanism and large valve stem. The valve core becomes both the flow control element and the sealing actuator.
Solution Approach 2:
The valve core is designed to perform multiple functions: it controls flow through its position, acts as the sealing element, and serves as the operating mechanism through its threaded driving portion. This multi-functionality eliminates the need for separate components, reducing valve stem size while maintaining forced sealing capability.
3Volume of moving object
If reduced port design is adopted to accommodate large valve stem, then valve size is reduced, but flow capacity is significantly impacted
Solution Approach 1:
The complex operating mechanism and large valve stem are extracted from the valve structure, replacing them with the simplified threaded driving portion integrated into the valve core. This extraction allows the valve body to maintain a compact size with full port design, preserving flow capacity while achieving forced sealing through the extracted and simplified mechanism.
Solution Approach 2:
The sealing action is achieved through a dimensional transformation where rotational motion of the valve core is converted into linear motion of the sealing surfaces through the threaded engagement. This dimensionality change allows compact valve design without sacrificing sealing force, as the linear sealing displacement is generated from rotation rather than requiring a large linear valve stem.
4Device complexity
If simple operating mechanism is used, then device complexity is reduced, but sealing reliability deteriorates
Solution Approach 1:
The threaded sections are pre-formed on the driving portion of the valve core during manufacturing. These preliminary threaded structures ensure that when the valve core rotates, the sealing action is automatically and reliably initiated without requiring complex control mechanisms. The preliminary action of thread engagement guarantees consistent seal pressing.
Solution Approach 2:
The valve core serves itself by using its own rotation to drive the sealing action through the threaded engagement. The simplified operating mechanism relies on the valve core's inherent motion to automatically press the seals against the seats, eliminating the need for external complex actuation systems while maintaining reliable sealing performance.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design enhances sealing reliability, reduces valve size, and improves flow capacity by allowing a round passage shape, making the valve more compact and adaptable to various applications while maintaining excellent sealing performance.
Implementation Method 1
The upper sealing member driving part and the lower sealing member driving part can move along the rotation axis of the valve core, and the upper sealing member driving part and the lower sealing member driving part drive the sealing members to press or detach from the valve seat
Implementation Method 2
upper and lower sealing member driving parts arranged inside the valve body and located on each side of the valve core respectively; and the sealing members arranged between the valve seat and the upper sealing member driving part and the lower sealing member driving part
Implementation Method 3
The upper driving shaft and the lower driving shaft drive the upper sealing member driving part and the lower sealing member driving part to move along the rotation axis of the valve core through threads
Data Source
AI summary
The present disclosure relates to a DBB forced sealing valve and an operating mechanism, including a valve body, a valve seat, a valve core arranged in the valve body, upper sealing member driving part and lower sealing member driving part arranged in the valve body and located on either side of the valve core, and the sealing members arranged between the valve seats and the upper sealing member driving part and the lower sealing member driving part. Wherein, the upper sealing member driving part and the lower sealing member driving part can move along the rotation axis of the valve core, and the upper sealing member driving part and the lower sealing member driving part drive the sealing members to press against or to retract from the valve seats.